I am in the process of replacing the differential rear mounts in my 86 300E (the ones you can see from the rear). Does anybody know, for sure, what size are the hex screws? I suspect they are 12 or 13 mm. Since I do not have neither size, I would like to buy the right one. Any tips where to buy them, other that the tool truck????

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J.H.
'86 300E